{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical", "Disease"], "input": "Value of methylprednisolone in prevention of the arthralgia - myalgia syndrome associated with the total dose infusion of iron dextran : a double blind randomized trial ."}
{"Chemical": ["methylprednisolone", "iron dextran"], "Disease": ["arthralgia", "myalgia"]}